Process for the manufacture of synthetic emerald stones



Patented Man 30, 1926."

JOSE FERRER RIERA, OF BARCELONA, SPAIN.

PROCESS FOR THE MANUFACTURE OF SYNTHETIO EMERALD STONES.

No Drawing.

To (/71 whom it may con cern:

lie it lcnown that I. Josi': FI'ZRRER RII'IRA, a subject of the King: of Spain, residing at 94 Glaris, Barcelona. Spain, have. invented Per- 5 rain new and useful Process-for thelllanuiacture of Synthetic Emerald Stones, of whicl1 the following is a specification.

The present invention has fer its objectv a process for the production of emerald stones by a synthetic method suc'h that the said 'n'ocessresults in a product which, when suitably cut and polished by the art of lapidary imitates in perfect'inanner emeralds that have a natural mineral origin.

The process in question is based on the (z-perati'on of melting a mixture of silica, ground or pulverized and tinted with green or greenish colouring matter, with hydrate or anhydrous oxide of glucinium and with alumina also hydrated or anhydrous. There is added to this mixture substances to serve as flux and fusion is then effected in suitable l'urnaces, such as oXy-hydrogen, Ozzy-acetylene or electrical furnaces.

The following is an example of the manner or" carrying out the invention:

90 grammes of rock crystal are heated nearly to red'heat and subjected to rapid cooli'ng by being plunged into cold Water in order that by this means the rock crystal may become more brittle. It is then triturated and pulverized.

The rock crystal thus triturated is submitted to the action of a bath consisting of a quantity of distilled Water which con-.

Application filed October 4, 1924. Serial No. 741,779.

added to this composition in the character of fluxfiO grammes of carbonate of lithia or caustic lithia, 15 gra-nnnesof fused boracic acid powderechand l grammes of sodium borate fused and pulverized.

The prepared mixture is melted in a cru- (-ible by means ofen cry-hydrogen or electric furnaceat a temperature of 1,600 to 1,900 l, and the product of fusionafter cooling is divided into pieces of the size corresponding to the desired size of the stones to be obtained, and the pieces are afterwards heated in a muffle to a temperature of from 600 to 800 C., until they become softened to a degree which will permit them to be moulded. This operation is preferably effected with the aid of tongs having arms sutiiciently large to .be able to easily effect the moulding and compression of the substance to give to the pieces the desired forms. By this treatment the product acquires aparticular appearance which renders it ineom parably more precious both as regards its texture and its colour, corresponding more nearly to those of the natural emerald, for the rest the product gains in density which nearly equals that of the emerald. This treatment takes a total ofpne half to three quarters of an hour.

' This product once it has been treated by the methods of 'lapidary by cutting and polishing acquires an appearance of emer; alds of natural or gln,

Lela 1m:-

A process of manufacture of synthetic emerald stones consisting in fusing a mix-- ture of silica, tinted with green or greenish colouring material, with hydrated or anhydrous oxide of glueinium and with alumina together with substances to act as flux,

subsequently breaking or dividinguip the.

fused mass obtained into fragments of determined size and heating the fragments anew in order to soften them, and finally subjecting the softened fragments to moulding or compression for the transformation of their appearance J OSE FERRER RIERA. 

